SELECTABLE-POWER PHOTOREACTOR FOR FLOW-INJECTION ANALYSIS SYSTEMS ANDHIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY POSTCOLUMN PHOTOCHEMICAL DERIVATIZATION

A new design for a post-column photochemical reactor is presented, dif fering from those described in the literature in that different workin g powers (between 8 and 40 W) may be selected in order to improve dete ction and linearity of response. The application of the device in post -column photoderivatization of phenolic aldehydes-both in high-perform ance liquid chromatography with UV-Vis or fluorescence detection (isoc ratic and gradient elutions) and in flow-injection analysis systems is discussed. Use of selectable-power photoreactors such as the one desc ribed here allows optimum conditions to be selected for each analyte. Moreover the coil length may be reduced.